#!/bin/sh

total="$(free -m | grep Mem: | awk '{ print $2 }')"
used="$(free -m | grep Mem: | awk '{ print $3 }')"

free=$(("$total" - "$used"))

if [ "$1" = "total" ]; then
	echo "$total"
elif [ "$1" = "used" ]; then
	echo "$used"
elif [ "$1" = "free" ]; then
	echo "$free"
fi
